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|
<?php
/**
* DBSchemaVersion.php - database backed schema versions
*
* Implementation of SchemaVersion interface using a database table.
*
* @author Elmar Ludwig
* @copyright 2007 Elmar Ludwig
* @license GPL2 or any later version
* @package migrations
*/
class DBSchemaVersion implements SchemaVersion
{
/**
* domain name of schema version
*
* @var string
*/
private $domain;
/**
* schema versions
*
* @var array
*/
private $versions = [];
/**
* @var array
*/
private $data = [];
/**
* Initialize a new DBSchemaVersion for a given domain.
* The default domain name is 'studip'.
*
* @param string $domain domain name (optional)
*/
public function __construct($domain = 'studip')
{
$this->domain = $domain;
$this->initSchemaInfo();
}
/**
* Retrieve the domain name of this schema.
*
* @return string domain name
*/
public function getDomain()
{
return $this->domain;
}
/**
* Initialize the current schema version.
*/
private function initSchemaInfo()
{
$this->data = [];
try {
$query = "SELECT version FROM schema_versions WHERE domain = ?";
$statement = DBManager::get()->prepare($query);
$statement->execute([$this->domain]);
$this->versions = $statement->fetchAll(PDO::FETCH_COLUMN);
} catch (PDOException $e) {
$query = "SELECT version FROM schema_version WHERE domain = ?";
$statement = DBManager::get()->prepare($query);
$statement->execute([$this->domain]);
$this->versions = range(1, $statement->fetchColumn());
}
}
/**
* Retrieve the current schema version.
*
* @return int schema version
*/
public function get()
{
return $this->versions ? max($this->versions) : 0;
}
/**
* Returns whether the given version is already present for the given
* domain.
*
* @param int $version Version number
* @return bool
*/
public function contains($version)
{
return in_array($version, $this->versions);
}
/**
* Set the current schema version.
*
* @param int $version new schema version
*/
public function add($version)
{
$version = (int) $version;
try {
$query = "INSERT INTO `schema_versions` (`domain`, `version`)
VALUES (?, ?)";
DBManager::get()->execute($query, [
$this->domain,
$version,
]);
StudipLog::log(
'MIGRATE_UP',
$version,
$this->domain
);
} catch (PDOException $e) {
$query = "UPDATE `schema_version`
SET `version` = ?
WHERE `domain` = ?";;
DBManager::get()->execute($query, [
$version,
$this->domain,
]);
}
NotificationCenter::postNotification(
'SchemaVersionDidUpdate',
$this->domain,
$version
);
}
/**
* Removes a schema version.
*
* @param int $version schema version to remove
*/
public function remove($version)
{
$version = (int) $version;
try {
$query = "DELETE FROM `schema_versions`
WHERE `domain` = ? AND `version` = ?";
DBManager::get()->execute($query, [
$this->domain,
$version
]);
StudipLog::log(
'MIGRATE_DOWN',
$version,
$this->domain
);
} catch (PDOException $e) {
$query = "UPDATE `schema_version`
SET `version` = ?
WHERE `domain` = ?";
DBManager::get()->execute($query, [
$version,
$this->domain,
]);
}
NotificationCenter::postNotification(
'SchemaVersionDidDelete',
$this->domain,
$version
);
}
/**
* @param $domain
* @param $version
* @return string
*/
static public function exists($domain, $version)
{
return (bool)DBManager::get()->fetchColumn(
"SELECT 1 FROM schema_versions WHERE `domain` = ? AND `version` = ?",
[$domain, $version]);
}
}
|
